Nothing
##==============================================================================
## cylindersegment : plots (part of) a cylinder
##==============================================================================
cylindersegment <- function (rx=1, ry=rx, from=pi, to=3*pi/2,
len=1, mid=c(0,0), angle=0, dr=0.01, col="black", delt =1.0, ...) {
base1 <- mid ; base1[1]<-mid[1]-len/2
base2 <- mid ; base2[1]<-mid[1]+len/2
if (from >to) {
a <- from
from <- to
to <- a
}
x <- c( seq(from,to,by=dr), to)
ex <- base1[1] + rx * cos(x)
ey <- base1[2] + ry * sin(x)
if (angle != 0) {
xy <- rotatexy (cbind (ex,ey) , angle=angle, mid=mid)
ex <- xy[,1];ey <- xy[,2]
}
x<-rev(x)
x2 <- base2[1] + rx * cos(x) * delt
y2 <- base2[2] + ry * sin(x) * delt
if (angle != 0) {
xy <- rotatexy ( cbind(x2,y2), angle=angle, mid=mid)
x2 <- xy[,1];y2 <- xy[,2]
}
ex <- c(ex, x2)
ey <- c(ey, y2)
polygon(ex, ey, col=col, border=col, ...)
} # end cylindersegment
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